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Macroeconomic Conversion Déjà Vu
Published online by Cambridge University Press: 11 June 2009
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Scope. Macroeconomic theory determines either an unemployment equilibrium or an inflation equilibrium. Consider an economy producing a single good. Unemployment theory determines the physical output of that good; inflation theory determines its price. Twice in the history of economic thought an unemployment equilibrium reversed itself into an inflation equilibrium. First, in the eighteenth century the unemployment equilibrium of William Petty (1662) and A. Yarranton (1677) reversed itself into the inflation equilibrium of David Hume (1752) and A. R. J. Turgot (1769–1770). Second, in our own century the unemployment equilibrium of J. M. Keynes (1936) reversed itself into the inflation equilibrium of Milton Friedman (1968).
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